--- /dev/null
+# CiviCRM 5.5.1
+
+Released 11 Sep 2018
+
+- **[Synopsis](#synopsis)**
+- **[Bugs resolved](#bugs)**
+- **[Credits](#credits)**
+- **[Feedback](#feedback)**
+
+## <a name="synopsis"></a>Synopsis
+
+| *Does this version...?* | |
+|:--------------------------------------------------------------- |:-------:|
+| Fix security vulnerabilities? | no |
+| Change the database schema? | no |
+| Alter the API? | no |
+| Require attention to configuration options? | no |
+| **Fix problems installing or upgrading from previous version?** | **yes** |
+| Introduce features? | no |
+| **Fix bugs?** | **yes** |
+
+## <a name="bugs"></a>Bugs resolved
+
+- **([dev/core#390](https://lab.civicrm.org/dev/core/issues/390))
+ Fix regression affecting smart-groups which predate 5.5.0 ([12803](https://github.com/civicrm/civicrm-core/pull/12803))**
+
+## <a name="credits"></a>Credits
+
+This release was developed by the following authors:
+
+Australian Greens - Seamus Lee; Lemniscus - Noah Miller; Wikimedia
+Foundation - Eileen McNaughton
+
+## <a name="feedback"></a>Feedback
+
+These release notes are edited by Tim Otten and Andrew Hunt. If you'd like to
+provide feedback on them, please login to https://chat.civicrm.org/civicrm and
+contact `@agh1`.